Nike canceled its Air Max USA sneaker release Monday after Colin Kaepernick complained the Betsy Ross flag decorating the shoes was a symbol of slavery— the shoes, however, are available for $2,500 on StockX, a popular streetwear auction site.

According to StockX, the sneakers originally retailed for $120. Which means at a $2,500 asking price, their perceived value increased 2,000%.

Goods are sold on StockX through the seller’s lowest asking price, or the seller accepting any offer from a bidder. At least nine pairs of the Air Max USA sold for $1,000 or more on the site.

The Betsy Ross flag, so-named for its creation during the Revolutionary War, features 13 stars for the United States’ 13 original colonies. It has been co-opted by extremist groups opposed to racial diversity, according to a chapter of the National Association for the Advancement of Colored People in 2016.

Although scholars agree Betsy Ross the person most likely didn't create the first American flag, detractors of its use (like Colin Kaepernick) say the flag represents a period of American history before slavery was abolished, and therefore is an offensive symbol, according to the Wall Street Journal.

In response to questions over its decision to stop selling the sneakers, “Nike has chosen not to release the Air Max 1 Quick Strike Fourth of July as it featured the old version of the American flag,” said a Nike spokesperson.